If \( (1+x)^{n}=C_{0}+C_{1} x+C_{2} x^{2}+\ldots \ldots+\ldots . . C_{n} x^{n} \), then \[ C_{0}....

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If \( (1+x)^{n}=C_{0}+C_{1} x+C_{2} x^{2}+\ldots \ldots+\ldots . . C_{n} x^{n} \), then
\( \mathrm{P} \)
\[
C_{0}^{2}+C_{1}^{2}+C_{2}^{2}+C_{3}^{2} \ldots .+C_{n}^{2}=
\]
W
(1) \( \frac{n !}{n ! n !} \)
(2) \( \frac{(2 n) !}{n ! n !} \)
(3) \( \frac{(2 n) !}{n !} \)
(4) None of these



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